Silicic acid drying equipment

Abstract

The utility model discloses silicic acid drying equipment, which belongs to the field of silicic acid preparation, and comprises a drying box, a first material stirring part, a second material stirring part, a motor, a first transmission part, a second transmission part and a heating wire, the stirring ends of the first stirring part and the second stirring part are both located in the drying box, a motor is fixed to the top of the drying box and is in transmission connection with the first stirring part through a first transmission part, the first stirring part is in transmission connection with the second stirring part through a second transmission part, and a heating cavity is formed in the side wall of the drying box. And a plurality of heating wires are fixed in the heating cavity. According to the silicic acid precipitate drying device, the drying efficiency is greatly improved, the time cost required by drying is reduced, and meanwhile, the stability and uniformity of the silicic acid precipitate drying quality are effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of silicic acid preparation, especially relates to a silicic acid drying equipment. BACKGROUND

[0002] In the wafer industry, the multi-element fluorine-containing waste acid is used for producing sodium fluorosilicate, and mother liquor is generated. The mother liquor mainly contains fluorosilicic acid, sodium fluorosilicate, hydrochloric acid and sodium chloride and the like. In the current industrial production, fluorosilicic acid is generated by the reaction of sodium fluorosilicate and hydrochloric acid, and based on the principle that fluorosilicic acid is hydrolyzed to precipitate silicic acid in an acidic environment, by adding an appropriate amount of hydrochloric acid to the mother liquor, silicic acid precipitate is successfully obtained, and at the same time, the hydrogen fluoride generated in the reaction is absorbed by water after being extracted by vacuum to form hydrofluoric acid. Then, the precipitate is filtered and washed to obtain relatively pure silicic acid, which is dried and reacted with caustic soda to finally synthesize soluble sodium silicate.

[0003] However, the existing silicic acid precipitate drying process mainly adopts a standing drying method. This method has many disadvantages. On the one hand, the drying efficiency is extremely low, which greatly affects the production progress and the capacity improvement; on the other hand, local overheating phenomenon is prone to occur in the drying process, which causes uneven heating of the silicic acid, and seriously affects the stability and consistency of the product quality. Therefore, it is urgent to develop a silicic acid drying equipment that can realize uniform heating and significantly improve the drying efficiency, which is of great significance for the efficient utilization of multi-element fluorine-containing waste acid in the wafer industry and the improvement of related product quality. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a silicic acid drying equipment to overcome at least one of the above-mentioned defects in the prior art.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a silicic acid drying equipment, which comprises a drying box, a first stirring part, a second stirring part, a motor, a first transmission part, a second transmission part and heating wires, the drying box is provided with the first stirring part and the second stirring part, the stirring ends of the first stirring part and the second stirring part are located in the inside of the drying box, the top of the drying box is fixedly provided with the motor, the motor is in transmission connection with the first stirring part through the first transmission part, the first stirring part is in transmission connection with the second stirring part through the second transmission part, the inside of the side wall of the drying box has a heating cavity, and a plurality of heating wires are fixedly arranged in the heating cavity.

[0007] Preferably, the first stirring part comprises a first bearing seat, a first rotating shaft and a first stirring plate, the first bearing seat is fixed to the top of the drying box, the lower part of the first rotating shaft penetrates through the first bearing seat and the top wall of the drying box and extends to the inside of the drying box and is fixedly provided with a plurality of first stirring plates.

[0008] Preferably, the second stirring piece comprises a second bearing seat, a second rotating shaft, a gear, a gear ring, an annular sliding rail, a sliding block, a vertical rod and a second stirring plate, the second bearing seat is fixed to the right side of the top of the drying box, the bottom end of the second rotating shaft penetrates through the second bearing seat and the top wall of the drying box and extends into the drying box to be fixed with the gear, the annular sliding rail is fixed to the top wall of the drying box, the bottom of the annular sliding rail is slidably connected with two sliding blocks, the bottom of the sliding block is fixed with the gear ring, the gear ring is engaged with the gear, the bottom of the gear ring is fixed with a plurality of vertical rods, the vertical rods are located outside the first stirring plate, and the inner side wall of the vertical rod is fixed with a plurality of second stirring plates.

[0009] Preferably, the first stirring plate and the second stirring plate are arranged in a staggered mode.

[0010] Preferably, the drying box is further provided with a hot air machine, an air pipe, a third bearing and a screen, the top of the drying box is fixed with the hot air machine, the air outlet end of the hot air machine is fixedly connected with the air pipe in communication, the first rotating shaft has a first cavity in the inside, the first stirring plate has a second cavity in the inside, the front and rear side walls of the first stirring plate are both provided with a plurality of air holes in communication with the second cavity, the second cavity is in communication with the first cavity, the inner upper portion of the first cavity is fixed with the third bearing, the air outlet end of the air pipe extends into the inside of the first cavity and penetrates through the third bearing, and the screen is arranged in the air hole.

[0011] Preferably, the drying box is further provided with a sealing ring, the sealing ring is arranged between the air pipe and the first cavity and below the third bearing.

[0012] Preferably, the first transmission piece comprises a first driving wheel, a first driven wheel and a first transmission belt, the first driving wheel is fixed to the output shaft of the motor, the first driven wheel is fixed to the first rotating shaft, and the first driving wheel and the first driven wheel are transmissionally connected through the first transmission belt.

[0013] Preferably, the second transmission piece comprises a second driving wheel, a second driven wheel and a second transmission belt, the second driving wheel is fixed to the first rotating shaft, the second driven wheel is fixed to the second rotating shaft, and the second driving wheel and the second driven wheel are transmissionally connected through the second transmission belt.

[0014] Preferably, the drying box is further provided with a heat insulation layer and a heat conduction layer, the inner side wall of the heating cavity is provided with the heat conduction layer, and the outer side wall of the heating cavity is provided with the heat insulation layer.

[0015] Preferably, the heat conduction layer is a heat conduction silica gel layer, and the heat insulation layer is a ceramic fiber layer.

[0016] The utility model discloses the beneficial effect is:

[0017] 1. During the drying process, the first and second agitators work together to continuously and comprehensively agitate the silica precipitate. This allows the silica precipitate to tumble and reposition within the drying space, avoiding the uneven heating problems caused by fixed positions in traditional static drying methods. This method ensures that every part of the silica precipitate absorbs heat from the heating wire evenly and efficiently, significantly improving drying efficiency, reducing drying time costs, and effectively ensuring the stability and uniformity of the dried silica precipitate quality, providing a high-quality raw material foundation for subsequent production and processing.

[0018] 2. A single motor, combined with a first and second transmission component, efficiently drives the agitation process during drying. This unique design allows a single motor to simultaneously drive both the first and second agitators. Compared to the traditional method of multiple motors driving each component separately, this not only greatly simplifies the equipment's power system and effectively reduces manufacturing and maintenance costs, but also ensures a high degree of synchronization and coordination between the first and second agitators. During the agitation of silica precipitate, the two agitators, driven by the same motor, precisely match speeds and angles to tumble and agitate the material from all directions and multiple angles.

[0019] 3. By using a circular slide rail and slider, the gear ring can maintain a precise running trajectory during rotation, effectively avoiding transmission errors caused by shaking or offset.

[0020] 4. The opposite rotation directions of the first and second stirring plates cause the silica precipitate to undergo more complex and comprehensive tumbling motion under the influence of forces from different directions. A portion of the silica precipitate is pushed to one side by the first stirring plate and simultaneously pushed in the opposite direction by the counter-rotating second stirring plate. This prevents the silica precipitate from concentrating in localized areas, greatly improving the uniformity of mixing and ensuring that all parts of the silica precipitate receive equal heating during the drying process, further reducing the occurrence of localized overheating or underheating. This not only improves heat exchange efficiency but also prevents material agglomeration.

[0021] 5. The first and second mixing plates are staggered, which not only avoids dead corners in the mixing process but also optimizes the heat transfer effect.

[0022] 6、Through the hot air, the silicon acid deposit can be acted on more closely and directly, compared with only relying on the overall thermal environment in the drying box, the heat transfer efficiency is greatly increased. The hot air is more fully contacted with the silicon acid deposit, so that the material can absorb heat faster, and the water evaporation is accelerated, thereby the drying time is shortened, and the production efficiency is improved. The hot air blown out of the air hole drives the air flow in the drying box to form local air circulation. The air flow can timely take away the water vapor evaporated on the surface of the silicon acid deposit, so that the water vapor concentration around the material is rapidly reduced, to create more favorable conditions for continuous water evaporation, and further accelerate the drying speed. Not only the drying efficiency is improved, but also the drying uniformity is improved, and the drying quality is optimized.

[0023] 7、Through the heat insulation layer, the temperature of the outer wall of the heating cavity can be effectively reduced, and heat transfer to other parts of the equipment is prevented. Through the heat conduction layer, the heat generated in the heating cavity can be quickly and efficiently transferred to the silicon acid deposit to be dried. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the utility model.

[0025] Figure 2 It is a front view structural schematic diagram of the first stirring part of the utility model.

[0026] Figure 3 It is a front view structural schematic diagram of the second stirring part of the utility model.

[0027] Figure 4 It is a bottom view structural schematic diagram of the annular slide rail and the sliding block of the utility model.

[0028] Figure 5 It is a cooperation structure schematic diagram of the air heater, the air pipe, the first rotating shaft, the third bearing, and the sealing ring of the utility model.

[0029] Figure 6 It is a sectional view structural schematic diagram of the first rotating shaft and the first stirring plate of the utility model.

[0030] Figure 7 It is a cooperation structure schematic diagram of the motor, the first transmission part, the first rotating shaft, the second transmission part, and the second rotating shaft of the utility model.

[0031] Figure 8 It is Figure 1 the enlarged structural schematic diagram of A.

[0032] The marks in the drawings are: 1-drying box, 2-motor, 3-first stirring part, 4-second stirring part, 5-first transmission part, 6-second transmission part, 7-heating wire, 8-heating cavity, 31-first bearing seat, 32-first rotating shaft, 33-first stirring plate, 41-second bearing seat, 42-second rotating shaft, 43-gear, 44-gear ring, 45-annular slide rail, 46-slide block, 47-stand, 48-second stirring plate, 9-hot air blower, 10-air pipe, 11-third bearing, 12-separation net, 13-first cavity, 14-second cavity, 15-air hole, 16-sealing ring, 51-first driving wheel, 52-first driven wheel, 53-first transmission belt, 61-second driving wheel, 62-second driven wheel, 63-second transmission belt, 17-heat insulation layer, 18-heat conduction layer. DETAILED DESCRIPTION

[0033] The utility model will be further explained in connection with the drawings and specific embodiments.

[0034] The contents not described in detail in the specification belong to the prior art known to the person skilled in the art. In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0035] As Figures 1 to 8As shown, the silicon drying device provided in the embodiment includes a drying box 1, a first stirring member 3, a second stirring member 4, a motor 2, a first transmission member 5, a second transmission member 6, and heating wires 7. The drying box 1 is provided with the first stirring member 3 and the second stirring member 4, and the stirring ends of the first stirring member 3 and the second stirring member 4 are located inside the drying box 1. The top of the drying box 1 is fixed with the motor 2, the motor 2 is in transmission connection with the first stirring member 3 through the first transmission member 5, the first stirring member 3 is in transmission connection with the second stirring member 4 through the second transmission member 6, the inside of the side wall of the drying box 1 has a heating cavity 8, and the heating cavity 8 is fixed with a plurality of heating wires 7. The top of the drying box has a feeding port, and the bottom of the drying box has a discharging port. The utility model uses the heating wires 7 as a heat source to continuously and stably supply the required heat for the drying link. In the drying process, the first stirring member 3 and the second stirring member 4 work cooperatively, and the two members are matched with each other to stir the silicon acid precipitate in all directions and uninterruptedly. In this way, the silicon acid precipitate can fully tumble and change positions in the drying space, avoiding the problem of uneven heating caused by fixed position in the traditional static drying mode. Through this mode, each part of the silicon acid precipitate can uniformly and efficiently absorb the heat from the heating wires 7, greatly improving the drying efficiency, reducing the time cost required for drying, effectively guaranteeing the stability and uniformity of the drying quality of the silicon acid precipitate, and providing high-quality raw material basis for subsequent production and processing.

[0036] The utility model adopts a motor 2, and combines the first transmission member 5 and the second transmission member 6 to realize efficient driving of the stirring operation in the drying process. This unique design architecture enables a single motor 2 to drive the first stirring member 3 and the second stirring member 4 to work cooperatively. Compared with the mode of driving by multiple motors 2 respectively, not only is the power system of the equipment greatly simplified, the manufacturing and maintenance costs of the equipment are effectively reduced, but also the high synchronism and coordination of the movement of the first stirring member 3 and the second stirring member 4 are ensured. When stirring the silicon acid precipitate, the two stirring members are driven by the same motor 2 to stir and turn the material in all directions and at multiple angles at an accurately matched speed and angle.

[0037] The first stirring member 3 includes a first bearing seat 31, a first rotating shaft 32, and a first stirring plate 33. The first bearing seat 31 is fixed to the top of the drying box 1, the lower part of the first rotating shaft 32 penetrates through the first bearing seat 31 and the top wall of the drying box 1, and extends into the inside of the drying box 1 and is fixed with a plurality of first stirring plates 33. The first rotating shaft 32 rotates to drive the first stirring plate 33 to rotate and stir the silicon acid precipitate in the drying box 1.

[0038] The second stirring part 4 comprises a second bearing seat 41, a second rotating shaft 42, a gear 43, a gear ring 44, an annular sliding rail 45, a sliding block 46, a vertical rod 47, and a second stirring plate 48. The second bearing seat 41 is fixed to the right side of the top of the drying box 1. The bottom end of the second rotating shaft 42 penetrates through the second bearing seat 41 and the top wall of the drying box 1 and extends into the drying box to be fixed with the gear 43. The annular sliding rail 45 is fixed to the top wall in the drying box 1. The bottom of the annular sliding rail 45 is slidably connected with two sliding blocks 46. The bottom of the sliding block 46 is fixed with the gear ring 44. The gear ring 44 is engaged with the gear 43. The bottom of the gear ring 44 is fixed with a plurality of vertical rods 47. The vertical rods 47 are located outside the first stirring plate 33. A plurality of second stirring plates 48 are fixed to the inner side wall of the vertical rods 47. The annular sliding rail 45 and the sliding block 46 are arranged to enable the gear ring 44 to always keep a precise running track during rotation, effectively avoiding transmission errors caused by shaking and deviation. The second rotating shaft 42 rotates to drive the gear 43 to rotate, so that the gear ring 44 rotates to drive the vertical rods 47 to rotate, and then drive the second stirring plates 48 to rotate. The rotating direction of the gear 43 is the same as that of the first rotating shaft 32. The rotating direction of the gear ring 44 is opposite to that of the first rotating shaft 32, so that the rotating directions of the second stirring plates 48 and the first stirring plate 33 are opposite. The opposite rotating directions of the first stirring plate 33 and the second stirring plate 48 promote the silicic acid precipitate to produce more complex and comprehensive rolling motion under the action of forces in different directions. A part of the silicic acid precipitate is pushed to one side by the first stirring plate 33, and at the same time, is pushed to the other direction by the second stirring plate 48 rotating in the opposite direction, avoiding the silicic acid precipitate from being concentrated in a local area, greatly improving the stirring uniformity, ensuring that each part of the silicic acid precipitate has equal opportunity to be heated during the drying process, and further reducing the occurrence of local overheating or insufficient heating. Not only improves the heat exchange efficiency, but also prevents material aggregation.

[0039] The first stirring plate 33 and the second stirring plate 48 are arranged in a staggered manner, which not only avoids stirring dead angles and optimizes the heat transfer effect.

[0040] The hot air machine 9, the air pipe 10, the third bearing 11 and the screen 12 are further included, the top of the drying box 1 is fixed with the hot air machine 9, the air outlet end of the hot air machine 9 is fixedly communicated with the air pipe 10, the first rotating shaft 32 has the first cavity 13 in the inside, the first stirring plate 33 has the second cavity 14 in the inside, the front and rear sidewalls of the first stirring plate 33 are both provided with a plurality of air holes 15, the air holes 15 are communicated with the second cavity 14, the second cavity 14 is communicated with the first cavity 13, the third bearing 11 is fixed to the inner upper portion of the first cavity 13, the air outlet end of the air pipe 10 extends to the inside of the first cavity 13 and passes through the third bearing 11, and the screen 12 is arranged in the air hole 15. When needed, the hot air machine 9 is started, the blown hot air enters the first cavity 13 through the air pipe 10, then enters the second cavity 14, and finally is blown out through the air hole 15. The hot air can act on the silicic acid deposit at a closer distance and more directly, greatly increases the heat transfer efficiency compared with only relying on the overall heat environment in the drying box 1. The contact of the hot air with the silicic acid deposit is more sufficient, so that the material can absorb heat faster, accelerates the evaporation of moisture, thereby shortens the drying time and improves the production efficiency. The hot air blown out of the air hole 15 can drive the air flow in the drying box 1 to form local air circulation. The air flow can timely take away the water vapor evaporated on the surface of the silicic acid deposit, rapidly reduces the water vapor concentration around the material, creates more favorable conditions for the continuous evaporation of water, and further accelerates the drying speed. Not only the drying efficiency is improved, but also the drying uniformity is improved and the drying quality is optimized. The screen 12 is arranged to play a blocking role, which can effectively prevent the silicic acid deposit from entering the inside of the first stirring plate 33 and ensure that the hot air is smoothly blown out.

[0041] The sealing ring 16 is further included, the sealing ring 16 is arranged between the air pipe 10 and the first cavity 13 and is located below the third bearing 11. The sealing ring 16 plays a sealing role, and the third bearing 11 is arranged to prevent the air pipe 10 from rotating with the first rotating shaft 32.

[0042] The first transmission member 5 includes the first driving wheel 51, the first driven wheel 52 and the first transmission belt 53, the first driving wheel 51 is fixed to the output shaft of the motor 2, the first driven wheel 52 is fixed to the first rotating shaft 32, and the first driving wheel 51 and the first driven wheel 52 are transmissionally connected through the first transmission belt 53. The motor 2 rotates to drive the first driving wheel 51 to rotate, the first driven wheel 52 is driven to rotate through the first transmission belt 53, so that the first rotating shaft 32 rotates.

[0043] The second transmission member 6 comprises a second driving wheel 61, a second driven wheel 62 and a second transmission belt 63, the second driving wheel 61 is fixed to the first rotating shaft 32, the second driven wheel 62 is fixed to the second rotating shaft 42, and the second driving wheel 61 and the second driven wheel 62 are transmissionally connected through the second transmission belt 63.

[0044] The heat insulation layer 17 and the heat conduction layer 18 are further included, the inner side wall of the heating cavity 8 is provided with the heat conduction layer 18, and the outer side wall of the heating cavity 8 is provided with the heat insulation layer 17.

[0045] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A silicic acid drying apparatus, characterized in that: it comprises a drying box, a first stirring member, a second stirring member, a motor, a first transmission member, a second transmission member and heating wires; the drying box is provided with the first stirring member and the second stirring member, and the stirring ends of the first stirring member and the second stirring member are located inside the drying box; the top of the drying box is fixed with the motor, and the motor is in transmission connection with the first stirring member through the first transmission member; the first stirring member is in transmission connection with the second stirring member through the second transmission member; and the inside of the side wall of the drying box is provided with a heating cavity, and a plurality of heating wires are fixed in the heating cavity.

2. The silicic acid drying apparatus according to claim 1, characterized in that: the first stirring member comprises a first bearing seat, a first rotating shaft and a first stirring plate; the first bearing seat is fixed to the top of the drying box, the lower part of the first rotating shaft passes through the first bearing seat and the top wall of the drying box and extends into the inside of the drying box and is fixed with a plurality of first stirring plates.

3. The silicic acid drying apparatus according to claim 2, characterized in that: the second stirring member comprises a second bearing seat, a second rotating shaft, a gear, a gear ring, an annular sliding rail, a sliding block, a vertical rod and a second stirring plate; the right side of the top of the drying box is fixed with the second bearing seat, the bottom end of the second rotating shaft passes through the second bearing seat and the top wall of the drying box and extends into the drying box and is fixed with the gear; the top wall in the drying box is fixed with the annular sliding rail, the bottom of the annular sliding rail is slidingly connected with two sliding blocks, the bottom of the sliding block is fixed with the gear ring, and the gear ring is in meshing connection with the gear; the bottom of the gear ring is fixed with a plurality of vertical rods, the vertical rods are located outside the first stirring plate, and the inner side wall of the vertical rod is fixed with a plurality of second stirring plates.

4. The silicic acid drying apparatus according to claim 3, characterized in that: the first stirring plate and the second stirring plate are arranged in a staggered manner.

5. The silicic acid drying apparatus according to claim 2, characterized in that: it further comprises a hot air blower, an air pipe, a third bearing and a screen; the top of the drying box is fixed with the hot air blower, and the air outlet end of the hot air blower is fixedly connected with the air pipe; the inside of the first rotating shaft is provided with a first cavity, the inside of the first stirring plate is provided with a second cavity, the front and rear side walls of the first stirring plate are each provided with a plurality of air holes, the air holes are in communication with the second cavity, and the second cavity is in communication with the first cavity; the inner upper part of the first cavity is fixed with the third bearing; the air outlet end of the air pipe extends into the inside of the first cavity and passes through the third bearing; and the air holes are provided with the screen.

6. The silicic acid drying apparatus according to claim 5, characterized in that: it further comprises a sealing ring; the sealing ring is arranged between the air pipe and the first cavity and is located below the third bearing.

7. The silicic acid drying apparatus according to claim 2, characterized in that: the first transmission member comprises a first driving wheel, a first driven wheel and a first transmission belt; the first driving wheel is fixed to the output shaft of the motor, and the first driven wheel is fixed to the first rotating shaft. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The first driving wheel and the first driven wheel are connected by a first transmission belt. 8.The silica drying device according to claim 3, characterized in that: The second transmission member comprises a second driving wheel, a second driven wheel, and a second transmission belt. The second driving wheel is fixed to the first rotating shaft, and the second driven wheel is fixed to the second rotating shaft. The second driving wheel and the second driven wheel are connected by a second transmission belt. 9.The silica drying device according to claim 1, characterized in that: It further comprises a heat insulation layer and a heat conduction layer. The inner side wall of the heating cavity has a heat conduction layer. The outer side wall of the heating cavity has a heat insulation layer.

10. The silicic acid drying apparatus according to claim 9, characterized by: The heat conduction layer is a heat conduction silica gel layer. The heat insulation layer is a ceramic fiber layer.

Images